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Silicon Nitride-Bonded Silicon Carbide Protection Tube
Silicon Nitride-Bonded Silicon Carbide
This high-performance composite ceramic material uses silicon carbide (SiC) as the matrix skeleton, with silicon nitride (Si3N4) formed as the bonding phase through high-temperature nitridation. The structure combines SiC's high thermal conductivity with Si3N4's toughness, creating an erosion-resistant, thermal-shock-stable system. It exhibits exceptional wear resistance and corrosion resistance against molten metals (e.g., aluminum, zinc, copper, magnesium), making it suitable for direct contact. Thus, Si3N4-SiC tubes offer high corrosion resistance and can operate in high-temperature kilns, diverse atmospheres, or direct immersion in molten liquids—ideal for heater protection sleeves.
Advantage
Ø High-Temperature Resistance: Safe use up to 1500°C; stable structure without softening.
Ø Thermal Shock Resistance: Extremely low coefficient of thermal expansion.
Ø Molten Metal Resistance: Resists erosion by Al, Zn, Cu, Pb, etc.; non-contaminating to molten metal and non-adherent to slag.
Ø Chemical Corrosion Resistance: Withstands acids, alkalis, industrial exhaust; excellent stability in oxidizing atmospheres.
Ø Lightweight: Density ≥2.65 g/cm³, apparent porosity ≤10.7%, improving thermal efficiency and reducing energy consumption.
Ø Electrical Insulation: High resistivity at room temperature, preventing short circuits.
Ø Rapid Thermal Response: Fast temperature sensitivity.
Application
1. Non-Ferrous Metal Smelting Protection
Ø Silicon carbide rod sleeves: Isolate heating elements (e.g., SiC rods) from molten Al/Zn, extending service life.
Ø Thermocouple protection tubes: Direct immersion in molten metal for temperature measurement.
2. High-Temperature Industrial Components
Ø Radiation tubes: Used in Al/Zn processing kilns, enhancing thermal efficiency by >25%.
Ø Kiln furniture & accessories: Saggers, pusher plates, roller tubes—resistant to thermal cycling with high load capacity.
3. Emerging Fields
Ø Waste incinerator linings, sintering supports for electronic ceramics, horizontal continuous casting separator rings.
Item |
Unit |
Data |
Density |
g/cm3 |
≥2.65 |
|
Porosity |
% |
≤10.7 |
Cold compressive strength |
MPa |
≥170 |
Cold bending strength |
MPa |
≥30 |
Max Working Temperature |
℃ |
1500 |
Thermal Conductivity |
W/MK |
15(1200℃) |
SiC |
% |
≥60 |
Si3N4 |
% |
≥37 |
Fe2O3 |
% |
≤1.5 |
FSi |
% |
≤1.0 |
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